Humor is associated with an increased immune response, particularly which antibody?

Humor is associated with an increased immune response, particularly which antibody?

• A. Immunoglobulin G
• B. Immunoglobulin M
• C. Immunoglobulin A
• D. Immunoglobulin E

Answer: (C)

Humoral immunity relies on antibodies circulating in body fluids to defend against pathogens. The antibody most linked to mucosal defense is IgA, which is the dominant immunoglobulin in secretions such as saliva, tears, nasal mucus, and intestinal secretions. Secretory IgA neutralizes pathogens at entry points and prevents them from attaching to and penetrating mucosal epithelial cells, providing a first line of defense with minimal inflammation. This mucosal role explains why an increased humoral response is particularly associated with IgA. Other antibodies have different primary roles—IgG protects body tissues systemically, IgM is the first responder in a new infection, IgE is involved in allergic and parasitic responses, and IgD mainly functions as a B cell receptor.

Humoral immunity relies on antibodies circulating in body fluids to defend against pathogens. The antibody most linked to mucosal defense is IgA, which is the dominant immunoglobulin in secretions such as saliva, tears, nasal mucus, and intestinal secretions. Secretory IgA neutralizes pathogens at entry points and prevents them from attaching to and penetrating mucosal epithelial cells, providing a first line of defense with minimal inflammation. This mucosal role explains why an increased humoral response is particularly associated with IgA. Other antibodies have different primary roles—IgG protects body tissues systemically, IgM is the first responder in a new infection, IgE is involved in allergic and parasitic responses, and IgD mainly functions as a B cell receptor.